Employee Retirement Benefits - Net Periodic Income Cost Recognizedf for OCI (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Reclassification from accumulated other comprehensive income (loss) to net income	$ 7,000,000	$ 5,000,000	$ 2,000,000
Tax effects on components of net periodic income (cost) recognized in OCI [Abstract]
Reclassification from accumulated other comprehensive income (loss) to net income, tax expense (benefit)	(2,000,000)	(1,000,000)	(1,000,000)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net gains (losses)	(139,000,000)	95,000,000	42,000,000
Reclassification from accumulated other comprehensive income (loss) to net income	7,000,000	6,000,000	5,000,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	(133,000,000)	101,000,000	47,000,000
Tax effects on components of net periodic income (cost) recognized in OCI [Abstract]
Net gains (losses)	(43,000,000)	29,000,000	13,000,000
Reclassification from accumulated other comprehensive income (loss) to net income, tax expense (benefit)	2,000,000	2,000,000	1
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	(1,000,000)	$ 0	$ 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax	$ 0